[doc] changed readme

readme.md

@@ -19,10 +19,7 @@ This module is built using CNES Patrius as a java library for space and flight d
 To run the module make sure you have JavaSE-11 installed.
 
 ```bash
-sudo add-apt-repository ppa:linuxuprising/java
-sudo apt update
-sudo apt install oracle-java11-installer
-sudo apt install oracle-java11-set-default
+sudo apt install openjdk-11-jre-headless
 ```
 
 Clone the repository and run: